ORGANIC CHEMISTRY-PACKAGE >CUSTOM<
ORGANIC CHEMISTRY-PACKAGE >CUSTOM<
10th Edition
ISBN: 9781260028355
Author: Carey
Publisher: MCG CUSTOM
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Chapter 9, Problem 23P

The alkane formed by hydrogenation of (S)-4-methyl-1-hexyne is optically active, but the one formed by hydrogenation of (S)-3-methyl-1-pentyne is not. Explain. Would you expect the products of hydrogenation of these two compounds in the presence of Lindlar palladium to be optically active?

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[5] Write the structure of the product of the reaction of (S)-3-bromo-3-methylhexane with ethanol (CH,CH,OH).
(1) Predict the outcome of the addition of HBr to (a) trans-2-pentene, (b) 2-methyl-2-butene, and (c) 4-methylcyclohexene. How many isomers can be formed in each case?
The heat of hydrogenation of cis-2,2,5,5-tetramethyl-3-hexene is -154 kJ (-36.7 kcal)/ mol, while that of the trans isomer is only -113 kJ (-26.9 kcal)/mol. Q.) If a catalyst could be found that allowed equilibration of the cis and trans isomers at room temperature (such catalysts do exist), what would be the ratio of trans to cis isomers?

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